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Method for detecting content of metaphosphoric acid in phosphoric acid

A technology of metaphosphoric acid and phosphoric acid, applied in the direction of color/spectral characteristic measurement, etc., can solve the problem that the value of metaphosphoric acid cannot be obtained, and achieve the effect of easy operation, good stability and easy acquisition

Inactive Publication Date: 2016-11-09
湖北省兴发磷化工研究院有限公司
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Problems solved by technology

[0003] At present, there is no method for detecting the content of metaphosphoric acid in phosphoric acid in China, and it is still impossible to obtain a specific value for metaphosphoric acid. The present invention aims at quantitative detection of metaphosphoric acid in phosphoric acid to guide the production of thermal phosphoric acid

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  • Method for detecting content of metaphosphoric acid in phosphoric acid
  • Method for detecting content of metaphosphoric acid in phosphoric acid
  • Method for detecting content of metaphosphoric acid in phosphoric acid

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[0017] The present invention will be further described below in conjunction with the examples, but the protection scope of the present invention is not limited to the scope expressed in the examples.

[0018] 1. Standard curve drawing: prepare 25g / L metaphosphoric acid solution, take seven 50ml volumetric flasks, add 5ml 5wt% ovalbumin solution and 5ml acetic acid-sodium acetate buffer solution with pH=4.7, and absorb 0,1 , 2, 4, 6, 8, 10ml of metaphosphoric acid standard solution was added to the above-mentioned 50ml volumetric flask, and the volume was made up with distilled water; the absorbance was measured at 210-220nm with a UV-visible spectrophotometer, and the results were shown in Table 1; The concentration is the abscissa, the absorbance value is the ordinate, draw the standard curve of metaphosphoric acid, and establish the linear relational equation of the corresponding metaphosphoric acid concentration and absorbance, see figure 1 .

[0019]

[0020] Table 1 ...

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Abstract

The invention discloses a method for detecting the content of metaphosphoric acid in phosphoric acid. The method includes the steps that 1, a metaphosphoric acid solution is prepared firstly, then metaphosphoric acid solutions with different amounts are taken and prepared into standard solutions with different concentrations, and a protein solution and a buffer solution with the same amount are added into each standard solution; the absorbance of the standard solutions with different concentrations is measured, a standard curve of metaphosphoric acid is drawn, and a corresponding linear relation equation of the metaphosphoric acid concentration and the absorbance is established; 2, a phosphoric acid sample is taken and prepared into a sample solution, and the protein solution and buffer solution with the same amount in the step 1 are added into the sample solution; then the absorbance of the sample solution is measured, the absorbance is substituted into the linear equation obtained in the step 1, and the percentage composition of metaphosphoric acid in the phosphoric acid sample is obtained through conversion. By means of the method, the content of metaphosphoric acid in phosphoric acid can be rapidly and accurately measured, operation is easy, the content of metaphosphoric acid can be monitored in real time, and production can be guided.

Description

technical field [0001] The invention relates to a method for detecting metaphosphoric acid in phosphoric acid, in particular to a method for detecting metaphosphoric acid using the property that metaphosphoric acid can precipitate proteins. Background technique [0002] Thermal phosphoric acid is to reduce phosphate rock with coke in the furnace in the presence of quartz, the elemental phosphorus obtained after the reduction of phosphate rock is sublimated into a steam state and escapes, and then the elemental phosphorus is burned to oxidize it into phosphorus pentoxide, and the water Absorbed and hydrolyzed into phosphorus. According to P at different temperatures 2 o 5 Different hydration reactions can produce orthophosphoric acid (abbreviated as phosphoric acid), pyrophosphoric acid and metaphosphoric acid, but the most important is orthophosphoric acid, and a small amount of metaphosphoric acid is often produced during the production process, which affects the quality ...

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Application Information

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IPC IPC(8): G01N21/31
CPCG01N21/31
Inventor 徐冉杜建侠韩国苗肖青燕薛数数
Owner 湖北省兴发磷化工研究院有限公司
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